Redesign the copresence audio handlers.

components/copresence/public/copresence_constants.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_CONSTANTS_
 #define COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_CONSTANTS_
 
 #include "media/base/channel_layout.h"
 
 namespace copresence {
 
 // Audio constants. Currently used from the AudioPlayer/AudioRecorder.
 // TODO(rkc): Make these values configurable then remove them from here.
 // Number of repetitions of the audio token in one sequence of samples.
 extern const int kDefaultRepetitions;
 
 // The default sample rate. We need to ensure that both the recorder and the
 // player on _all platforms use the same rate.
 extern const float kDefaultSampleRate;
 extern const int kDefaultBitsPerSample;
 
 // 18500 for ultrasound, needs to be consistent between platforms.
 extern const float kDefaultCarrierFrequency;
 
 // The next two really need to be configurable since they don't need to be
 // consistent across platforms, or even playing/recording.
 extern const int kDefaultChannels;
 extern const media::ChannelLayout kDefaultChannelLayout;
 
+// These constants are used from, everywhere.
+// Particularly, these are used to index the directive lists in the
+// audio manager, so do not change these enums without changing
+// audio_directive_list.[h|cc].
+enum AudioType {
+  AUDIBLE = 0,
+  INAUDIBLE = 1,
+  BOTH = 2,
+  UNKNOWN = 3,
+};
+
 }  // namespace copresence
 
 #endif  // COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_CONSTANTS_